Rope-thrusting shovel with differential thrust



ROPE THRUSTING SHOVEL WITH DIFFERENTIAL THRUST Filed July 14, 1928 2 Sheets-Sheet l /A'VENTOR A TTORNE K5( Nov. 4, 1930. M. L. FYKsE 1,780,351

ROPE THRUSTING SHOVEL WITH DIFFERENTIAL THRUST Filed July 14, 1928 2 sheets-sheet 2 igl--F ATTORNEY.

Patented Nov. 4, 1930 l Y UNITED; STATES PATENT OFFICE:l

`MITCHELL L. FYKSE, OF SOUTH MILWAUKEE, WISCONSIN ROPE-THRUSTING SIIOVEL WITH DIFFERENTIAL THB/UST Application filed July 14, 1928. Serial No. $392,779.

My invention relates to new and useful shipper-shaft drum eiects reciprocation of improvements in rope thrusting shovels with the clipper-handle. differential thrust. Rope-thrusts have been found in practice Steam-shovels are well known in the eXcato be much superior to the expedient of con- Q vating art. They have aboom, with a clipper veying power up the boom from themain 55 and clipper handle mounted thereon for Inoengine to the shipper-shaft, by sprocket tion with respect to a. liXed pivot, located chain, ropes, or shafting. about lialic way up the boom, known as the However, it has beenfound that when the shipper-shaft. A hoistrope passing from dipper is thrust way out, especially in the '10. the dipper,overasheave at the outerpoint of case of excavators with eXtra-long dipper the booma t0 a Winch 0n the main frame 0f handles, the tension in the hoist rope is not the excavator, Serves t0 move the Clipper in alone suicient to give as powerful a thrust a circular arc about the shipper-shaft, this {lS may be ClGSled, @SPGCLHy When digging mgtion'being known as hoisting, A boomin frozen ground. And the situation is -no engine Serves t0 reciprocate 'the hahd1e,thug better, in the machines which convey the 55 moving the dipper radially with respect t0 power up the boom, as already mentioned. the ShppeI--Shaft this motion being known Accordingly it ,has been proposed to einas thrusting. .'All the digging operations P105 a Splml ShHDPGr-Sliaft drum, SO that, are performed yby a proper combination of When 'Phe dlPPel" 1S thrust Way 01110 the ropes hoisting and thrusting at the will of the op- Wlu 11,@ 0n gOOVeS 0f larg@ dlameter and 70 em/t0n Y hence impart a more powerful thrust in this With the advent of gasoline and Diesel POSOH- But .this has the, adynmge that powa-in the field of excavation, a gasoline the retraction in this position will b e slow. 01- Diesel b00m engine was found to be im- Also this arrangement does not give the 25 practical and this situation iinally resulted POWQFu1 thrust necessu'y When digging in in the development of =r0pe` thmsting frozen ground close in under the foot of the shovels," now well-known in the art. A ropeboom' thrusting shovel is one which has no boom- MY mvnfntlon Obvlayes dus dlsadvantage engine, but rather accomplishes thrusting by by employmg EL larg@ dlameter Shpplfshaft to means 0f the tension' inthe hosbro which drum for the thrusting, and a small-diameter so tgnson is due to thewveight of the dil-)pep shipper-shaft drum for the retraction, thus handle, dipper and contents, plus the resist- Securing l powerfitthmst and @Speedy m' ance of the bank during digging traction, in all positions of the dipper.

i In one type of ropethmstng Shovel the And by placing the twodrums on separate, n hoistrope basses from a Winch on the main althoughl cooperating shaits, I secure plenty e5 frame of the machine. over a sheave at the 0I 1.00m im Wmding my mp6s lvl-tho there' point Of th@ boom7 thence under a. heave on by undulywideiiing or weakening my boolin. the dipper, thence back over a sheave at the Vege are dw pnnclpal Obicts of my m' 40 pomt of the boom .thence to im anhomge Further objects and advantagesof iny inso fm a drum on the Shlpper'sha'ft' Thls drum vention will be readily evident, as the de is known as the shipper-shaft drum. Thus Scripton progresses.

th? tenslon m the .holsnmpe tends'to rotate The invention consists in the novel parts, thls dum Thls tendency 1$ Controlled, @11d and in the combinations and arrangements may ,be reversed, by mother rope l'unmng thereof, which are defined in the appended 35 direct from the WYlCh t0 th@ Shipper-Shaft claims; and of which one embodiment is eX- drum, and known as the retreating rope. empliiied in the accomparivng drawings Keyed to the same shaftas the shipper-shaft which are hereinafter particularly described drum are pinions, engaging racks on the and explained.

dipper-handle, so that the rotation of the Throughout the description, the same refer 10Ql und ence number is applied to the same member or to similar members.

Figure 1 is a side elevation oi' a power shovel embodying my invention.

Figure 2 is a plan view ot the drums and associated machinery, mounted on the boom.

rc 3 a side elevation ot the parts shown .in Figure 2.

Figure 4 is a section along the line marked 4-4 in Figure 3.

Referring to the drawings, it will be secu that 6 is the main base ot the power shovel, supportingl the boom '7, ill-frame 8 and main winch 9.

rifhe main winch 9 includes two constantly rotating shafts 10 and 11, rotated by any convenient power source (not shown).

On shaft 10 is drum 12, provided with a brake (not shown) and a clutch (not shown) whereby to clutch it to the constantly rotating shaft 10.

@n shaft 11 is drum-13 with its brake (not shown) and clutch (not shown).

YDrums 12 and 13 serve to haul in on ropes 14 and 15 respectively.

By means ot the clutches and brakes on drums 12 and 13 either or" the two ropes 14 and 15 can be paid out, held or pulled in at the will of the operator.

Rope 14 is the hoist rope, 1t passes from the drinn 12 over one of tw-o sheaves 16 at the outer end of the boom 7, around a sheave 17 attached to the dipper 18, back around the other sheave 16 to an anchorage on drum 19 keyed to shipper shaft 20.

Also keyed to this shipper shaft are two pinions 21 which engage two racks 22, each of which is mountedon the underside of one of the twin clipper handles 23.

It will thus be seen that the tension in the hoist rope 14 tends to rotate the drum 19, and hence the shipper shaft 20, and hence the pinions 21. all in a clockwise direction as shown in Figures 1.and 3, and thus tends to thrust the dipper and handle outwardly, i. e. to the right in. those two figures.

This tendency is restrained by the rope 15, which is wound on the drinn 24. Drum 24 is keyed to shaft 25. Keyed to this saine shaft are two gears 26, which engage corresponding gears 27, keyed to the shipper shaft 20. Rope 15 is wound on drum 24 in the same direction that rope 14 is wound on drum 19, so that a pull on rope 15 will tend to counteract and overcome the tension in rope 14. Drum 24 has a smaller effective diameter than drum 19, which may be accomplished either by having the actual diameter of drum 24 smaller than that of drum 19, as shown, or by establishing proper gear-ratios.

Accordingly when the rope 15 is paid out, and rope 14 is held, the tension in rope 14 is thereby permitted to @Heet thrusting out of the clipper; whereas, when the rope 15 is 4 hauled in, this results in retracting the dipper.

together.

It rope 15 be held, the hauling in of rope 14 eilects hoisting, and the paying out of rope 14 etlects lowering of the dipper.

rEhe thrusting tendency of the tension in the hoist rope 14 is sulhcient to thrust out the clipper with suiicient force in all positions ot the dipper, due to the large size of drum 19.

rllhe clipper handles are held with their racks 22 in engagement with pinions 21, by means ot' saddle blocks 28.

Having now described and illustrated one torni ot my invention, I wish it to be understood that my invention is not to be limited to the specific form or arrangement of parts hereinbetore described, except in so far as such limitations are specified in the appended claims.

l claim:

l. In a power shovel, including a boom, and a clipper and dipper handle mounted thereon tor reciprocation and swinging with respect thereto, the combination of: racks on said handle to effect reciprocation; pinions mounted on said boom and engaging said racks; two drums on the boom to rotate with said pinions; a hoist rope to swing said clipper, and wound upon only one of said drums, in such a way that the tension in the hoist rope yexerts a. constant tendency to thrust said dipper outwardly; and a retracting rope wound upon only the other of said drums, thereby being available at will to resist and control said tendency; said second drum being of an effective diameter less than that ofsaid first drum. l

2. In a power shovel, including a boom, and a dipperand dipper handle mounted thereon for reciprocation and swinging with respect thereto, the combination of: racks on said handle to reffect reciprocation, pin ions mounted on said boom and engaging said racks; two drums on the boom to rotate with said pinions; ahoist rope to swing said dipper, and wound upon only one of said drums, in such a way that the tension in the hoist rope exerts a constanttendency to thrust said dipper outwardly; and a retracting rope wound upon only the-otherv of said drums. thereby being. available at will to resist and control said tendency; said two drums being' arranged in tandem on separate shafts geared 3. In a power shovel, including a boom, and a dipper and dipper handle mounted thereon for reciprocation and swinging with respect thereto, the combination of: racks on said handle to effect reciprocation; pinions mounted on said boom and engaging said racks; two drums on the boom to rotate with said pinions; a. hoist rope to swing said dipner, and wound upon only one of said drums, in such a way that the tension in the hoist rope exerts a. constant tendency to thrust said dipper outwardly; and a retracting rope wound upon onlyfthe other ofsaid' drums,

thereby being available at will to resist and control said tendency; said second drum being of an eiective diameter less than that of said first drum; said two drums being arranged in tandem on separate shafts geared together.

4:. In a rack-and-pinion rope thrusting snovel: the utilization of two shipper-shaft drums of different effective diameter, arranged in tandem on two separate shafts, geared together, in place oi the conventional sin gle drum. i

5. In a rack-and-pinion rope thrusting shovel: the utilization of two shipper-shaftdruins of different effective diameter, in place of the conventional single drum; the drum associated with the hoist rope having a larger effective diameter than that of the drum associated with the retracting rope.

G. In a rack-and-pinion rope thrusting shovel: the utilization of two shipper-shaft drums of diiierent effective diameter, in place of the conventional single drum; the druni associated with the hoist rope having a larger effective diameter than that of the drinn associated with the l'etracting rope; the two drums being arranged in tandem on two separate shafts geared together.

In testiinon)7 whereof I affix inv signature.

MITCHELL L. "FYKSE 

